P
US9567271B2ActiveUtilityPatentIndex 51

Process for the recovery of paraffins from an isomerization effluent

Assignee: UOP LLCPriority: Sep 3, 2014Filed: Sep 3, 2014Granted: Feb 14, 2017
Est. expirySep 3, 2034(~8.2 yrs left)· nominal 20-yr term from priority
Inventors:KUMAR MANOJSHECTERLE DAVID JAMES
C07C 5/277C10G 65/043C10G 7/02C07C 7/00C07C 9/15C10G 45/58
51
PatentIndex Score
0
Cited by
10
References
20
Claims

Abstract

A process for the recovery of C 4 hydrocarbons from a C 5 /C 6 isomerization zone. A portion of the effluent stream from the C 5 /C 6 isomerization zone comprising C 4 hydrocarbons is combined in a stabilizer section with an effluent from a C 4 isomerization zone. In order to increase the C 4 hydrocarbons in the effluent stream from the C 5 /C 6 isomerization zone, a chilling zone may be used.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A process for the recovery of C 4  hydrocarbons comprising:
 stabilizing and separating a first effluent stream in a first stabilization zone into an overhead stream, a C 4−  liquid stream, and a bottoms stream, wherein the first effluent stream is from a first isomerization zone; 
 stabilizing a second effluent stream from a second isomerization zone in a second stabilization zone; 
 passing at least a portion of the C 4−  liquid stream to the second stabilization zone; and, 
 separating the second effluent stream and the at least a portion of the C 4−  liquid stream into a C 4  stream and a C 3−  stream. 
 
     
     
       2. The process of  claim 1  further comprising:
 separating the C 4  stream into an iC 4  stream and a nC 4  stream. 
 
     
     
       3. The process of  claim 2  further comprising:
 passing the iC4 stream to the second isomerization zone. 
 
     
     
       4. The process of  claim 1  wherein the first stabilization zone comprises a stabilizer, a receiving zone and a chilling zone. 
     
     
       5. The process of  claim 4  further comprising:
 passing a C 4−  stream from the stabilizer to the receiver; 
 separating the C 4−  stream in the receiver into a vapor stream and a liquid stream, the liquid stream comprising the C 4−  liquid stream. 
 
     
     
       6. The process of  claim 5  further comprising:
 cooling the vapor stream from the receiver in the chilling zone. 
 
     
     
       7. The process of  claim 5  further comprising:
 combining a portion of the vapor stream from the receiver and the C 3−  stream of the second stabilization zone. 
 
     
     
       8. The process of  claim 1  further comprising:
 operating the first isomerization zone under isomerization conditions, in the presence of a catalyst, to convert iso-paraffins into normal paraffins. 
 
     
     
       9. The process of  claim 8  wherein the iso-paraffins comprise iso-pentane and iso-hexane. 
     
     
       10. The process of  claim 9  further comprising:
 operating the second isomerization zone under isomerization conditions, in the presence of a catalyst, to convert iso-butane into normal butane. 
 
     
     
       11. A process for the recovery of C 4  hydrocarbons comprising:
 passing a C 4−  liquid stream to a stabilization zone, the liquid C 4−  stream comprising at least a portion of an effluent from a first isomerization zone for isomerization of C 5+  hydrocarbons operated under isomerization conditions to convert iso-paraffins into normal paraffins, wherein the C 4−  liquid stream is generated by separation of the effluent from the first isomerization zone; 
 passing at least a portion of a second effluent stream from a second isomerization zone for isomerization of C 4  hydrocarbons to the stabilization zone, the second effluent stream comprising C 4−  hydrocarbons, wherein the second isomerization zone is operated under isomerization conditions to convert iso-butane into normal butane; and 
 separating the at least a portion of the second effluent stream and the C 4−  liquid stream into a C 4  stream and a C 3−  stream in the stabilization zone. 
 
     
     
       12. The process of  claim 11  wherein the iso-paraffins comprise iso-pentane and iso-hexane. 
     
     
       13. The process of  claim 12  further comprising:
 cooling a portion of the effluent from the first isomerization zone to increase an amount of C 4  hydrocarbons in the liquid C 4−  stream. 
 
     
     
       14. The process of  claim 11  further comprising:
 combining a first vapor stream from the stabilization zone comprising a C 3−  stream with a second vapor stream comprising a second C 3—  stream wherein the second C 3−  stream is generated by separation of the effluent of the first isomerization zone. 
 
     
     
       15. The process of  claim 14  wherein the second C 3−  stream comprises a portion of the effluent from the first isomerization zone. 
     
     
       16. The process of  claim 11  further comprising:
 separating the C 4  stream from the stabilization zone into an iC 4  stream and an nC 4  stream. 
 
     
     
       17. The process of  claim 16  further comprising:
 passing the iC 4  stream to the second isomerization zone. 
 
     
     
       18. The process of  claim 11  further comprising:
 separating the effluent from the first isomerization zone into a C 4−  stream and a C 5+  stream; and, 
 separating the C 4−  liquid stream from at least a portion of the C 4—  stream. 
 
     
     
       19. The process of  claim 18 , further comprising:
 separating the C 4−  stream into the C 4−  liquid stream and a C 3−  vapor stream. 
 
     
     
       20. The process of  claim 19  further comprising:
 increasing an amount of C 4  in the C 4−  liquid stream by cooling the C 4−  stream.

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